<!DOCTYPE html>
<body>
<div id="foo" style="width: 200px; height: 1000px; will-change: transform; background-color: lightgray;"></div>

<!-- The squashing layer will contain the following two divs. Note that the second is 100px lower than the top. -->
<div style="position: absolute; z-index: 0; top: 0px; width: 100px; height: 500px"></div>
<div style="position: absolute; z-index: 0; top: 500px; width: 100px; height: 100px">
  <iframe frameborder=0 id="subframe" srcdoc="<body style='height: 200px'>test1</body>">
  </iframe>
</div>
</body>
